Final Result which one we are going to create according to this tutorial in the very very simple steps using photoshop.
So, let’s start! In the beginning create new document about 500×500 pixels and fill it with linear gradient by using colors like #f0f0f0 and #c2c2c2.
After that create a new layer, then use the Elliptical Marquee Tool to create rounded selection in the middle of the canvas and after that select some appropriate colors, for example #f2f2f2 and #c9c9c9 and drag a linear gradient again.
After that use Select > Modify > Feather for blurring selection borders about 1 pixel, then apply Select > Modify > Contract to reduce selected area for 3 pixels and press Ctrl+Shift+I (the same function as Select > Inverse) to invert selection. Ok, then get out the Burn Tool (Brush: 100 px, Range: Highlights, Exposure: 15%) and make bottom plate’s edge a little bit darker.
After that use the Dodge Tool (Brush: 100 px, Range: Highlights, Exposure: 20%) and make the opposite plate’s edge brighter.
Ok, now press Ctrl+D to deselect this area. Then use the Elliptical Marquee Tool again to create one more selection again. Try to make the same selection as mine on the picture below. It should be created selected area in the middle of plate’s area.
Use Select > Modify > Feather for blurring selection borders about 1 pixel again. After that select the Burn Tool with the same presets and try to make the same burn work as on my picture below:
Then change Burn Tool to Dodge Tool and add brighter gradient to selected area in the bottom.
Now, use Select > Modify > Contract to contract selection about 15 pixels and apply again both of Burn Tool and Dodge Tool one more time.